Male forename, name of two saints.
St Isidore of Seville (c. 560–636), a Spanish archbishop and Doctor of the Church. He is noted for his Etymologies, an encyclopedic work used by many medieval authors. His feast day is 4 April.
St Isidore the farmer (c. 1080–1130), the Spanish patron of Madrid, and of farmers; he worked as a labourer on a farm near Madrid, and according to one legend was once seen being assisted in his ploughing by a second team of white oxen driven by angels. His emblem is a sickle, and his feast day is 15 May.